This app allows you to calculate or estimate what the total cost would be when shopping. The app is not on Google Play. You will have to unzip the apk file to your phone or tablet. It saves the prices as you type them, so no need to worry about losing them when your phone goes dead. It also remembers last zip code used and also be customized to have town names assigned to zip codes(since zipcodes is the only way it can locate the correct tax). Also in the zip file theres a source code file pas file. Plus no data used and you can download the zip file to a computer and put the apk file on a sd card to not used data when installing it.
NOTE: THIS APP IS NOT RESPONSIBLE FOR INCORRECT ANSWERS. IT SHOULD BE USED TO GET AN IDEA OF HOW EXPENSIVE THE TOTAL COST WILL BE.